There is no way to fix this as long as X11 is still being used. Lock screen timing issues are usually caused by a few different things:
1- Hardware issues. Certain models of computers have known issues where they don't generate the proper events when the laptop lid is closed or the suspend hotkey is pressed. In those cases, the laptop will enter the suspend state before notifying the OS, which results in the screen not being locked when the laptop wakes up. These issues need to be addressed with a firmware update, or with a quirk being added to whatever platform specific driver is in the kernel. This is the type of thing that is tested and fixed when a laptop gets certified and preloaded with Ubuntu. 2- Actual bugs in the screen locking code. This has happened in the past, and still occurs occasionally. 3- X11 not allowing the screen lock to forcibly remove keyboard and mouse grabs. This is the major reason why screen locking will never work reliably as long as we haven't switched to Wayland or Mir. For the screen to lock, it must be able to exclusively grab the keyboard or mouse. Unfortunately, there is no way under X11 to forcibly remove a keyboard or mouse grab that belongs to another application. When this happens, for example when you have a menu open, or you're using software such as Virtalbox, the screen is unable to lock before the laptop goes into suspend mode. -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-screensaver in Ubuntu. https://bugs.launchpad.net/bugs/1280300 Title: Desktop contents displayed on resume, before lock screen is shown Status in gnome-screensaver package in Ubuntu: Invalid Bug description: I am running 14.04. When I resume from sleep, the contents of my desktop (including any open windows, emails, etc) are displayed onscreen briefly before the unlock screen is shown. This potentially allows an attacker to view the contents of a locked screen. To reproduce: 1) Suspend a machine, e.g. by closing the lid 2) Resume the machine Expected results: Upon resume, the first thing shown onscreen is the screensaver unlock screen. Actual results: Upon resume, the first thing shown onscreen is the set of open windows that were displayed before the machine was put to sleep. After a second or two, the unlock screen is drawn and you have to enter a password to unlock the machine. This is reproducible on my system. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: gnome-screensaver 3.6.1-0ubuntu9 ProcVersionSignature: Ubuntu 3.13.0-8.28-generic 3.13.2 Uname: Linux 3.13.0-8-generic x86_64 ApportVersion: 2.13.2-0ubuntu2 Architecture: amd64 CurrentDesktop: Unity Date: Fri Feb 14 09:05:50 2014 DistributionChannelDescriptor: # This is a distribution channel descriptor # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor canonical-oem-somerville-precise-amd64-20130203-1 EcryptfsInUse: Yes GnomeSessionIdleInhibited: No GnomeSessionInhibitors: None GsettingsGnomeSession: org.gnome.desktop.session session-name 'ubuntu' org.gnome.desktop.session idle-delay uint32 300 InstallationDate: Installed on 2013-12-02 (73 days ago) InstallationMedia: Ubuntu 12.04 "Precise" - Build amd64 LIVE Binary 20130203-13:50 SourcePackage: gnome-screensaver UpgradeStatus: Upgraded to trusty on 2014-02-12 (1 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1280300/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
